| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional evaporator such that the heat conductivity of a group of a downstream pipes drops since the heat flux becomes smaller than that on upstream side because the temperature difference between the cooling water flowing in a pipe and the refrigerant flowing around the pipe becomes smaller downstream though the flow velocity of the cooling water flowing within the heat conductive pipe is roughly constant. SOLUTION: An evaporator 12, where many heat conductive pipes 15 for circulating cooling water are arranged in a bundle within a container 14 wherein a refrigerant is introduced, is arranged so that the total sectional area of a passage may be smaller downstream than upstream in flow direction, in comparison of the total sectional area of the passage of the heat conductive pipes 15 in each position in flow direction of cooling water. Hereby, the flow velocity of the cooling water in the downstream passage increases, so even if the temperature difference between the cooling water and the refrigerant is small, the heat flux becomes large, and the heat conductivity in the group D of the pipes rises.
|
